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- Title
Constraints on pulsed emission model for repeating FRB 121102.
- Authors
Shota KISAKA; Teruaki ENOTO; Shinpei SHIBATA
- Abstract
Recent localization of the repeating fast radio burst (FRB) 121102 revealed the distance of its host galaxy and luminosities of the bursts. We investigated constraints on the young neutron star (NS) model, that (a) the FRB intrinsic luminosity is supported by the spin-down energy, and (b) the FRB duration is shorter than the NS rotation period. In the case of a circular cone emission geometry, conditions (a) and (b) determine the NS parameters within very small ranges, compared with that from only condition (a) discussed in previous works. Anisotropy of the pulsed emission does not affect the area of the allowed parameter region by virtue of condition (b). The determined parameters are consistent with those independently limited by the properties of the possible persistent radio counterpart and the circumburst environments such as surrounding materials. Since the NS in the allowed parameter region is older than the spin-down timescale, the hypothetical GRP (giant radio pulse)-like model expects a rapid radio flux decay of ≲1Jy within a few years as the spin-down luminosity decreases. The continuous monitoring will provide constraints on the young NS models. If no flux evolution is seen, we need to consider an alternative model, e.g., the magnetically powered flare.
- Subjects
LUMINOSITY; EMISSIONS (Air pollution); NEUTRON stars; ANISOTROPY; RADIO pulse time modulation
- Publication
Publications of the Astronomical Society of Japan, 2017, Vol 69, Issue 6, p1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psx093